Improvement in key systems for quadruplex telegraphs



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FRANCIS W. JONES OF CHICAGO, ILLINOIS, ASSIGNOR TO WESTERN UNIONTELEGRAPH COMPANY, OF NEW YORK, N. Y.

IMPROVEMENT lN KEY SYSTEMS FOR QUADRUPLEX TELEGRAPHS.

Specification forming part of Letters Patent No. 218,181, dated August5, 1879; application filed December 14, 1878.

To all whom it may concern.-

Be it known that I, FRANCIS W. JoNEs, of Chicago, in the county of Cookand State of Illinois, have invented a new and useful 1mprovem ent inKey Systems for Quadruplex Telegraphs, which is fully described in thefollowing specification, reference being had to the accompanyingdrawings, in which- Figure 1 represents a side elevation of my improvedkey system; and Fig.2, a plan view of the relay system heretoforepatented by me, with sounders connected therewith.

My present invention relates entirely to the transmitting apparatus orkey system, and is an improvement on Letters Patent No. 191,440, whichwere granted to me May 29, 1877.

The improvement is, however, intended for use in connection with mydifferential relay system, for which Letters Patent No. 191,439 werealso granted to me May 29, 1877 hence I have shown the said relay systemin connection with my improved key system, (though the formerconstitutes no part of my present invention,) in order that theoperation of my present improvement may be perfectly understood.

In the key system described in the Patent No. 191,440 there are threeseparate batteries, combined with transmitters and wires constructed andarranged in a special manner.

The present invention consists in a special arrangement of the battery,wires, and transmitters, whereby but a single battery is used, a part ofit being cut out or the entire batteryforce employed, as may be desired,as will be hereinafter fully described, and more distinctly pointed outin the claim.

In the drawings, A and B represent two transmitters, which are mounted011 pivotal bearings, in the ordinary way, and are of the usualwell-known construction in their general features. Thesetransmitting-levers are provided with contact-points, attached to eachend of the-respective levers. The points a of the transmitter A areinsulated, as shown in the drawings. The point I) on one end of thetransmitter B is also insulated; but the point I) at the other end ofsaid transmitter is connected directly to the lever without insulation.

Contact-springs are also mounted upon the levers A B, two of them, 0 0,being arranged on the lever A, and two, d d, on the lever B, and all ofthem insulated, in the usual way, by supporting them on ordinaryinsulating-blocks.

Contact-points C (J and D D are mounted on insulating-posts, and arelocated over the springs, respectively, which are arranged on the leversA and B, as above described. These points are ordinary contact-points,and are so Well known as to require no further description.

A third contact-point, a, is mounted 011 the transmitter A, between thetwo end points, and is insulated like theothers. A third insulatedcontact-spring, e, is also mounted on the same transmitter near thiscontact-point, and aboveitis arranged an insulated contact-point, E,similar to the points 0 D.

A single battery, X, is employed, of any desired number of cups,collected together in the usual way. The positive pole of this batteryis connected, by a wire, .v, with the insulated point D on thetransmitter B, and the negative pole, by a wire, y, to the insulatedpoints 6 O. A third wire, 2, attached to one of the cup-connections ofthe battery, extends thence to the contact-point D.

The points a on the transmitter A are connected together and to thecontact-spring d on the transmitter B by means of a wire, F.

A wire, G, connects the contact-poiuts E and D, and the contact-point aon the transmitter A is connected, by a wire, H, to the contact-spring don the transmitter B, and a wire, I, connects the contact'spring c tothe wire G.

The relay system is connected to the contactspring e by a wire, T, whichconnects with the relay system in the same manner as described and shownin my Patent No. 191,440.

The contact-spring c on the transmitter A and the transmitter B arepermanently connected to ground respectively by wires J and K.

It will be understood, of course, that the apparatus is provided withthe usual devices for opening and closing the transmitters.

It is evident from the description above that under certain conditionsthe wire 2 will divide 2 2lSJSl the battery X into two parts, Y and Z,and these parts may be proportioned to each other, as described, bymaking the connection at the suitable point.

The transmitters maybe brought into either one of four relations to eachother. First, both may be open; second, transmitter A may be opened andB closed: third, A may be closed and B open: and,t'ourth, both may beclosed.

In the drawings the transmitters are shown in the first condition, andit will be found by tracing the connections that the line-circuit isgrounded and the battery stands open, and consequently no current willflow to line.

In the second condition contact is made be tween the point I) and thespring (1', and broken between the point I) and the spring (I. and atthe same time made between this spring (I and the point h. The fullcurrent of battery X will now be sent to line through the wire at thepositive pole of the battery.

In the third condition contact is broken between the point and thespring 0, and at the same time made between said spring and the point a.Contact will also be broken between the spring 0 and the point a, andmade between this spring andthepoint t"; also broken between the point aand the spring e, and made between this spring and the point E. Thetransmitter I; will remain in the position shown in Fig. 1 of thedrawings.

By tracing the connections it will be found that the wire .ris open, thewire is grounded, the wire 2 is brought into connection with the line;hence acurrent will flow to line through the wire y from the section ot'the battery.

In the fourth condition the transmitter A will be placed in the samerelation as above described in the third condition, and the transmitterB in the relation deseribed for the second condition.

wire .1" is grounded, the wire 2 open, and the wircyplaeedin connectionwith the line; hence a full battery-current will flow to line from thenegative pole through the wire i From this explanation it \\'Ill be seenthat the order in which the currents are sent to line it will now befound that the bythe key system herein shown and described does notditt'er from that covered in my former Patent No. 191,439.

In my present invention, however, there is a new arrangement oftransmitters, wires, and batteries, and a separate ground-wire isattached to each transmitter, thereby enabling each to ground theline-wire independently of the other; but at the same time a certainmutual dependence by the transmitters on each other for line-connectionis maintained.

I do not limit my improvement to the precise construction andarrangement of parts shown in the drawings. Forinstance, the additionalspring and points on the transmitter A maybe arranged diflerently, andperhaps more conveniently provided, only that they are illsulatedproperly. The connections with the battery may also be reversed, so faras the relation of the poles is concerned; and I do not limit myself toany arbitrary division of the battery, but each section may be composedof any desired number of cups, as may be determined by the necessitiesof the circuit. Other nnchanical changes may be made in the systemwithout changing the principle of operation which constitutes myimprovement; and although, as stated above, this key system is intendedespecially to be used with my patented difi'erential relay system, I donot limit myself to this specific application, but claim the systemconstructed and operating substantially as described wherever it isapplicable.

Having thus described myinvention, what I claim, and desire to secure byLetters Patent, 1s-

The double transmitters A and B, provided with a series of contactsprings and points, as specified, in combination with theconnectingwires I (I, ll, and I, the ground-wires J and K, the batteryX, and connecting-wires x y z, and the line-wire '1, all arranged andoperating substantially as described.

FRANCIS W. JONES.

Witnesses:

L. A. HUNTING,

JNO. C. MAoGREGoR.

